52 field notes · free to read

Every number
worth knowing.

Fifty-two researched notes on off-grid power, water, food storage, communications and safety. Each one opens with a specific figure that changes a decision, names the mistake people make, and tells you what it costs in watt-hours. No filler, no top-ten lists.

These go out one a week by email. All of them are free to read here.

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NO. 01 · Solar & Power

How much solar do you actually need?

Four steps on a napkin. No guessing, no sales pitch.

NO. 02 · Solar & Power

The cheaper battery usually isn't

Lead-acid gives you half of what the label says.

NO. 03 · Solar & Power

167 amps vs 42 amps, same power

The voltage decision that saves you hundreds in copper.

NO. 04 · Comms & Mesh

Starlink is not an accessory

It can rival your fridge in daily watt-hours.

NO. 05 · Safety

"It's only 12 volts" starts fires

The danger was never the voltage.

NO. 06 · Water

Filters don't stop viruses

The gap that puts people flat on their back.

NO. 07 · Food Storage

Rice that outlives your rig

Three barriers, pennies a bucket, 30 years.

NO. 08 · Safety

The cheapest thing that saves lives

It isn't a knife, a gun, or a battery.

NO. 09 · Solar & Power

PWM throws away a third of your panels

The $80 part that acts like free solar.

NO. 10 · Rig Systems

Build log: tearing into the rig

Everything getting replaced, and why.

NO. 11 · Solar & Power

Two inverter numbers, not one

The one people forget shuts the system down.

NO. 12 · Solar & Power

Don't charge lithium below freezing

The mistake that permanently kills an expensive battery.

NO. 13 · Comms & Mesh

Encrypted text, no towers, no bill

The comms layer nobody's heard of.

NO. 14 · Water

Never fill from a garden hose

A $25 mistake people make at every fill-up.

NO. 15 · Solar & Power

Your fridge doesn't pull what the box says

Duty cycle is the number that matters.

NO. 16 · Safety

The fuse protects the wire, not the device

Six rules that prevent fires. All boring.

NO. 17 · Food Storage

The one place we don't improvise

You can't see it, smell it, or taste it.

NO. 18 · Cost & Value

The last 20% is the expensive 20%

Why a smaller array plus a backup beats a huge array.

NO. 19 · Rig Systems

Build log: the composting toilet

No black tank. Here's the actual trade.

NO. 20 · Power & Generation

Your engine is already a generator

Two hours of driving ≈ a good solar day.

NO. 21 · Solar & Power

Voltage is a terrible fuel gauge

Lithium sits flat, then falls off a cliff.

NO. 22 · Food Storage

Freeze dryer: worth it or not?

Honest math on the biggest purchase in food storage.

NO. 23 · Solar & Power

Power station or DIY? Honest comparison

One isn't better. Here's how to actually pick.

NO. 24 · Comms & Mesh

GMRS or ham — which license?

One takes an afternoon. One takes a weekend.

NO. 25 · Solar & Power

The outage kit that actually works

You don't need a rig to need power.

NO. 26 · Safety

Your first-aid kit is built for paper cuts

Off-grid changes the math completely.

NO. 27 · Solar & Power

Series vs parallel, without wrecking them

Two wires, two very different outcomes.

NO. 28 · Water

Rainwater arrives nearly distilled

Then people ruin it. Here's the fix.

NO. 29 · Rig Systems

Build log: the AC decision

The heaviest load in the rig, made survivable.

NO. 30 · Power & Generation

Small wind: the honest numbers

The cube rule explains all the disappointment.

NO. 31 · Food Storage

A pantry you never open is a museum

The habit that makes storage actually work.

NO. 32 · Solar & Power

One shaded panel drags down the string

Shade isn't proportional. It's worse.

NO. 33 · Comms & Mesh

The one comms device I'd never skip

Everything else on the list is convenience.

NO. 34 · Safety

Check your BMS spec this week

Five minutes that protects your most expensive part.

NO. 35 · Water

Build log: the water system

The part that kills pumps, and the cheap fix.

NO. 36 · Solar & Power

Find the 20W you're leaking

Ten minutes. Often worth a whole battery.

NO. 37 · Power & Generation

The source that never sleeps

100 watts, 24 hours a day, beats a big array.

NO. 38 · Cost & Value

The cheapest upgrades, ranked

None are exciting. All are correct.

NO. 39 · Food Storage

Beans need 90 minutes of boiling

Have you budgeted that propane?

NO. 40 · Solar & Power

Build the skeleton, fill it in later

Three decisions now that save thousands.

NO. 41 · Safety

Open your emergency exit. Today.

They get painted over, blocked, and seized.

NO. 42 · Rig Systems

Build log: what the whole thing cost

Every line item, including the mistakes.

NO. 43 · Water

Greywater fills faster than you think

It's usually what limits how long you stay.

NO. 44 · Solar & Power

How long will it last tonight?

The runtime math, in four steps.

NO. 45 · Comms & Mesh

One bar into working data

What a booster can and can't do.

NO. 46 · Solar & Power

Powering a CPAP off-grid

Doable, cheap, and worth getting right.

NO. 47 · Power & Generation

Buying a generator too big

The mistake that wastes fuel and kills engines.

NO. 48 · Safety

The test that finds hidden problems

Voltage drop reveals what nothing else does.

NO. 49 · Food Storage

Skip the freeze dryer, buy this instead

Most of the benefit, a fraction of the cost.

NO. 50 · Solar & Power

"400W" is a laboratory number

What the spec sheet doesn't put in big type.

NO. 51 · Safety

Water always wins

The winterizing checklist, before the first freeze.

NO. 52 · Field Notes

A year of this: what held, what didn't

The five things that mattered most.